<?php
namespace app\shop\controller;
use think\Input;
use think\Controller;
class Common extends Controller{
    protected $sys;
    public function initialize(){ 
        $this->sys = cache('System'); 
        $this->assign('sys',$this->sys); 
    }
    public function _empty(){
        return $this->error('空操作，返回上次访问页面中...');
    }
}